Felicia from Mommy Excursions emailed in this tip:
The national average cost for a gallon of milk is $3.79, or $0.24 a cup. To make this stretch farther, we simply add four cups of water to half a gallon of whole milk. This will make an extra eight cups of milk per gallon resulting in the cost being $0.16 a cup. We use, on average, two gallons of milk each week so this method saves us around $133 a year!
If you are interested in trying this, I recommend that you always buy whole milk and always add the water before first drinking any milk from the container. Lastly, it can be hard to get used to. I recommend starting out slow by adding a half cup to one cup water per half gallon milk for a week or two, then go to two cups and gradually work up to adding four cups of water per half gallon. -Felicia